code: def offset(self, num_to_skip):
          
          return self.__class__(
              self._parent,
              projection=self._projection,
              field_filters=self._field_filters,
              orders=self._orders,
              limit=self._limit,
              offset=num_to_skip,
              start_at=self._start_at,
              end_at=self._end_at,
          )
docs: Skip to an offset in a query.
  
          If the current query already has specified an offset, this will
          overwrite it.
  
          Args:
              num_to_skip (int): The number of results to skip at the beginning
                  of query results. (Must be non-negative.)
  
          Returns:
              ~.firestore_v1beta1.query.Query: An offset query. Acts as a
              copy of the current query, modified with the newly added
              "offset" field.