man fsck.nfs (Administration système) - Dummy fsck.nfs script that always returns success.
NAME
fsck.nfs - Dummy fsck.nfs script that always returns success.
SYNOPSIS
fsck.nfs
DESCRIPTION
Debian GNU/Linux need this for when the root file system is on NFS: there is no way to find out if root is NFS mounted and we really want to do a "fsck -a /".
EXIT CODE
The exit code returned by mount.nfs is always zero, meaning successful completion.