docs: def deletePartials(self, dryrun=False):
          """ Delete any old partial uploads/downloads in path. """
          for (vol, path) in self.extraVolumes.items():
              if not path.endswith(".part"):
                  continue
              if self._skipDryRun(logger, 'INFO', dryrun=dryrun)("Delete subvolume %s", path):
                  continue
              self.butterVolumes[vol.uuid].destroy()