code: def _should_mount(self, only_mount=None, skip_mount=None):
          
  
          om = only_mount is None or \
              self.index in only_mount or \
              self.info.get('lastmountpoint') in only_mount or \
              self.info.get('label') in only_mount
          sm = skip_mount is None or \
              (self.index not in skip_mount and
               self.info.get('lastmountpoint') not in skip_mount and
               self.info.get('label') not in skip_mount)
          return om and sm
docs: Indicates whether this volume should be mounted. Internal method, used by imount.py