How to get rid of phantom directories /Volumes on a Mac? [closed]
Before removing anything, run mount and eject or more safely, I would disable every network connection, detach all drives and then reboot.
At that point you can be sure all the directories are actual directories (except the system mounts) and clean them safely and strategically.
Going forward, I would never mount anything here. Let the system manage it if at all possible. Make a different mount point if you want to make manual network mounts.