SMB file change notifications not triggered when making local changes

I have some code that uses dotnetcore filesystemwatcher to trigger when changes are made to directories.

When the directory is a SMB share on Unraid, and changes are made from a docker container the underlying directory, the SMB share does not trigger the change.

E.g.

SMB share \\server\share\foo points to /mnt/user/foo

Windows client monitors for changes in \\server\share\foo

Docker container writes changes to /mnt/user/foo

Windows client is not notified of the changes.

Is this expected behavior with Samba on Linux (I did not test), or is this something with Unraid and user shares that are not triggering Samba changes?