diff --git a/file_system.go b/file_system.go
index d67fcee..56ccac2 100644
--- a/file_system.go
+++ b/file_system.go
@@ -433,7 +433,10 @@ type SetInodeAttributesRequest struct {
 	Inode InodeID
 
 	// The attributes to modify, or nil for attributes that don't need a change.
-	Size *uint64
+	Size  *uint64
+	Mode  *os.FileMode
+	Atime *time.Time
+	Mtime *time.Time
 }
 
 type SetInodeAttributesResponse struct {
diff --git a/samples/memfs/fs.go b/samples/memfs/fs.go
index 730636f..4a752a6 100644
--- a/samples/memfs/fs.go
+++ b/samples/memfs/fs.go
@@ -281,7 +281,7 @@ func (fs *memFS) SetInodeAttributes(
 	defer inode.mu.Unlock()
 
 	// Handle the request.
-	inode.SetAttributes(req.Size)
+	inode.SetAttributes(req.Size, req.Mode, req.Mtime)
 
 	// Fill in the response.
 	resp.Attributes = inode.attributes
diff --git a/samples/memfs/inode.go b/samples/memfs/inode.go
index a878fcc..e906545 100644
--- a/samples/memfs/inode.go
+++ b/samples/memfs/inode.go
@@ -18,6 +18,7 @@ import (
 	"fmt"
 	"io"
 	"os"
+	"time"
 
 	"github.com/jacobsa/fuse"
 	"github.com/jacobsa/fuse/fuseutil"
@@ -373,7 +374,10 @@ func (inode *inode) WriteAt(p []byte, off int64) (n int, err error) {
 // Update attributes from non-nil parameters.
 //
 // EXCLUSIVE_LOCKS_REQUIRED(inode.mu)
-func (inode *inode) SetAttributes(size *uint64) {
+func (inode *inode) SetAttributes(
+	size *uint64,
+	mode *os.FileMode,
+	mtime *time.Time) {
 	// Update the modification time.
 	inode.attributes.Mtime = inode.clock.Now()
 
@@ -392,4 +396,14 @@ func (inode *inode) SetAttributes(size *uint64) {
 		// Update attributes.
 		inode.attributes.Size = *size
 	}
+
+	// Change mode?
+	if mode != nil {
+		inode.attributes.Mode = *mode
+	}
+
+	// Change mtime?
+	if mtime != nil {
+		inode.attributes.Mtime = *mtime
+	}
 }
diff --git a/samples/memfs/memfs_test.go b/samples/memfs/memfs_test.go
index 6bd4252..9c3d5ba 100644
--- a/samples/memfs/memfs_test.go
+++ b/samples/memfs/memfs_test.go
@@ -859,7 +859,6 @@ func (t *MemFSTest) ReadsPastEndOfFile() {
 
 func (t *MemFSTest) Truncate_Smaller() {
 	var err error
-
 	fileName := path.Join(t.mfs.Dir(), "foo")
 
 	// Create a file.
@@ -888,7 +887,6 @@ func (t *MemFSTest) Truncate_Smaller() {
 
 func (t *MemFSTest) Truncate_SameSize() {
 	var err error
-
 	fileName := path.Join(t.mfs.Dir(), "foo")
 
 	// Create a file.
@@ -917,7 +915,6 @@ func (t *MemFSTest) Truncate_SameSize() {
 
 func (t *MemFSTest) Truncate_Larger() {
 	var err error
-
 	fileName := path.Join(t.mfs.Dir(), "foo")
 
 	// Create a file.
@@ -945,9 +942,38 @@ func (t *MemFSTest) Truncate_Larger() {
 }
 
 func (t *MemFSTest) Chmod() {
-	AssertTrue(false, "TODO")
+	var err error
+	fileName := path.Join(t.mfs.Dir(), "foo")
+
+	// Create a file.
+	err = ioutil.WriteFile(fileName, []byte(""), 0600)
+	AssertEq(nil, err)
+
+	// Chmod it.
+	err = os.Chmod(fileName, 0754)
+	AssertEq(nil, err)
+
+	// Stat it.
+	fi, err := os.Stat(fileName)
+	AssertEq(nil, err)
+	ExpectEq(os.FileMode(0754), fi.Mode())
 }
 
 func (t *MemFSTest) Chtimes() {
-	AssertTrue(false, "TODO")
+	var err error
+	fileName := path.Join(t.mfs.Dir(), "foo")
+
+	// Create a file.
+	err = ioutil.WriteFile(fileName, []byte(""), 0600)
+	AssertEq(nil, err)
+
+	// Chtimes it.
+	expectedMtime := time.Now().Add(123 * time.Second).Round(time.Second)
+	err = os.Chtimes(fileName, time.Time{}, expectedMtime)
+	AssertEq(nil, err)
+
+	// Stat it.
+	fi, err := os.Stat(fileName)
+	AssertEq(nil, err)
+	ExpectEq(0, fi.ModTime().Sub(expectedMtime))
 }
diff --git a/server.go b/server.go
index 811c34b..28ebf3e 100644
--- a/server.go
+++ b/server.go
@@ -182,6 +182,18 @@ func (s *server) handleFuseRequest(fuseReq bazilfuse.Request) {
 			req.Size = &typed.Size
 		}
 
+		if typed.Valid&bazilfuse.SetattrMode != 0 {
+			req.Mode = &typed.Mode
+		}
+
+		if typed.Valid&bazilfuse.SetattrAtime != 0 {
+			req.Atime = &typed.Atime
+		}
+
+		if typed.Valid&bazilfuse.SetattrMtime != 0 {
+			req.Mtime = &typed.Mtime
+		}
+
 		// Call the file system.
 		resp, err := s.fs.SetInodeAttributes(ctx, req)
 		if err != nil {