-to be either a non-zero GID to limit it to a single group
-(e.g. "operator" or "admin"), or "-1" to allow any group
-to create remote directories.
+to be either a non-zero numeric GID to limit it to a single group (e.g. the
+.BR "operator " or " admin"
+GID), or
+.B "-1"
+to allow any user/group to create remote directories. By default, it is
+.B "0"
+to limit remote/striped directories to only the root user.