code: def mount(self, identifier):
          
  
          driver = self.client.info()['Driver']
          driver_mount_fn = getattr(self, "_mount_" + driver,
                                    self._unsupported_backend)
          cid = driver_mount_fn(identifier)
  
          # Return mount path so it can be later unmounted by path
          return self.mountpoint, cid
docs: Mounts a container or image referred to by identifier to
          the host filesystem.