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Solve the following problem using Python, implementing the functions described below, one line at a time
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Description:
 def offset(self, num_to_skip):
 """Skip to an offset in a query with this collection as parent. See :meth:`~.firestore_v1beta1.query.Query.offset` for more information on this method. 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. """

        query = query_mod.Query(self)
        return query.offset(num_to_skip)