I use notify to watch a path which is mount by nfs，notify didn't work and no error return

[co0ontty]

What you did (as detailed as you can)

I use notify to watch a path which is mount by nfs，notify didn't work and no error return

What you expected

I want recive a error when notify can't watch this path

[0xpr03]

You need to use the PollWatcher for network mounts. See also stackoverflow.

Notify can't tell whether this will work, as the kernel just doesn't send any events for the NFS mount. The "recommended" watcher, is the correct backend for your OS, but sadly that doesn't help with special file systems like NFS mounts.

[co0ontty]

If possible, can you return an error when the nfs type appears in the directory?

[0xpr03]

We don't know when something is NFS. As far as I know, we would have to scan your mounts and detect an NFS system, even across soft- and hard-links. (And fuse file systems won't tell you what it is in the mount points.) That seems out of scope to me.