I think you are thinking of filters in a way not intended. Filters are used for security not for report retrieval. It limits the intersections where you can see data. Of course, you might want to look at metaread filters. The limit you to metadata members you are allowed to see. In your example. if you frill from the parent to the children and have a metaread filter on, the only members returned in the drill down would be the children in the filter
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