src/main/java/com/googlecode/objectify/impl/QueryImpl.java
void setAncestor(final Object keyOrEntity) {
		final com.google.cloud.datastore.Key key = loader.ofy.factory().keys().anythingToRawKey(keyOrEntity);
		this.actual = this.actual.andFilter(PropertyFilter.hasAncestor(key));
	}
void setAncestor(final Object keyOrEntity) {
		final com.google.cloud.datastore.Key key = loader.ofy.factory().keys().anythingToRawKey(keyOrEntity);
		this.actual = this.actual.andFilter(PropertyFilter.hasAncestor(key));
	}
Modifies the instance