Makes a physically remote file system that is currently
    accessible to local users inaccessible.
    Dismounts a remote file system or directory from local device
    DNFSn: (the mount point).
    Related commands: MOUNT, SHOW MOUNT
    Applies to: NFS client
    Format
      DISMOUNT  { mount_point | logical_name }
                [ /ALL ]
                [ /HOST=host ]
                [ /[NO]WAIT ]