GAE ancestor query without ancestor in the results

Ancestor queries in GAE can return the ancestor in the results:

• when ancestor and query kind are the same, eg.:
  SomeModel.query(ancestor=some_key)
• on kindless query, eg.:
  ndb.Query(ancestor=some_key)

To filter out ancestor instance from being fetched use filter on __key__:

SomeModel.query(ancestor=some_key).filter(SomeModel.key > some_key)

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