There are certain Kernel versions which do not send individual
Forget operations after they receive "not implemented" for Batch Forget.
One example is "5.4.0-110-generic" on Ubuntu 20.04. I am sure there are
plenty of others.
This leads to inode "leaks". Where reference counts are never decreased
and the inodes were left hanging around long after they are not needed
The best way to fix that was adding support for batch operations to the
lib. This way all users will be able to benefit from the batching
Co-authored-by: Doychin Atanasov <email@example.com>