diff --git a/samples/memfs/dir.go b/samples/memfs/dir.go
deleted file mode 100644
index 3e96f91..0000000
--- a/samples/memfs/dir.go
+++ /dev/null
@@ -1,66 +0,0 @@
-// Copyright 2015 Google Inc. All Rights Reserved.
-// Author: jacobsa@google.com (Aaron Jacobs)
-
-package memfs
-
-import (
-	"fmt"
-
-	"github.com/jacobsa/fuse"
-	"github.com/jacobsa/fuse/fuseutil"
-	"github.com/jacobsa/gcloud/syncutil"
-)
-
-type memDir struct {
-	/////////////////////////
-	// Mutable state
-	/////////////////////////
-
-	mu syncutil.InvariantMutex
-
-	// The contents of the directory. An entry with inode zero is unused.
-	//
-	// This array can never be shortened, nor can its elements be moved, because
-	// we use its indices for Dirent.Offset, which is exposed to the user who
-	// might be calling readdir in a loop while concurrently modifying the
-	// directory. Unused entries can, however, be reused.
-	//
-	// TODO(jacobsa): Add good tests exercising concurrent modifications while
-	// doing readdir, seekdir, etc. calls.
-	//
-	// INVARIANT: For each i, entries[i].Offset == i+1
-	entries []fuseutil.Dirent
-}
-
-func newDir() (d *memDir) {
-	d = &memDir{}
-	d.mu = syncutil.NewInvariantMutex(d.checkInvariants)
-
-	return
-}
-
-func (d *memDir) checkInvariants() {
-	for i, e := range d.entries {
-		if e.Offset != fuse.DirOffset(i+1) {
-			panic(fmt.Sprintf("Unexpected offset in entry: %v", e))
-		}
-	}
-}
-
-// Find the inode ID of the child with the given name.
-//
-// LOCKS_EXCLUDED(d.mu)
-func (d *memDir) LookUpInode(name string) (id fuse.InodeID, ok bool) {
-	d.mu.RLock()
-	defer d.mu.RUnlock()
-
-	for _, e := range d.entries {
-		if e.Name == name {
-			ok = true
-			id = e.Inode
-			return
-		}
-	}
-
-	return
-}
diff --git a/samples/memfs/file.go b/samples/memfs/file.go
deleted file mode 100644
index c29e5d4..0000000
--- a/samples/memfs/file.go
+++ /dev/null
@@ -1,36 +0,0 @@
-// Copyright 2015 Google Inc. All Rights Reserved.
-// Author: jacobsa@google.com (Aaron Jacobs)
-
-package memfs
-
-import (
-	"errors"
-	"sync"
-
-	"github.com/jacobsa/fuse"
-)
-
-type memFile struct {
-	/////////////////////////
-	// Constant data
-	/////////////////////////
-
-	inode fuse.InodeID
-
-	/////////////////////////
-	// Mutable state
-	/////////////////////////
-
-	mu sync.RWMutex
-
-	// The current contents of the file.
-	contents []byte // GUARDED_BY(mu)
-}
-
-// TODO(jacobsa): Add a test that various WriteAt calls with a real on-disk
-// file to verify what the behavior should be here, particularly when starting
-// a write well beyond EOF. Leave the test around for documentation purposes.
-func (f *memFile) WriteAt(p []byte, off int64) (n int, err error) {
-	err = errors.New("TODO(jacobsa): Implement memFile.WriteAt.")
-	return
-}