rpc.umntall(8) on FreeBSD

The text 9f54cc465568, as FreeBSD 7.0-RELEASE, FreeBSD 6.3-RELEASE, FreeBSD 6.2-RELEASE, FreeBSD 6.1-RELEASE, FreeBSD 6.0-RELEASE shipped it.

notify NFS servers about unmounted NFS file systems

Flags it lists