void MOUNTPROC3_UMNT(dirpath) = 3;
Procedure UMNT removes the mount list entry for the directory that was previously the subject of a MNT call from this client. AUTH_UNIX authentication or better is required.
Typically, server implementations have maintained a list of clients which have file systems mounted. In the past, this list has been used to inform clients that the server was going to be shutdown.
There are no MOUNT protocol errors which can be returned from this procedure. However, RPC errors may be returned for authentication or other RPC failures.