Get Facebook page's feed without page's postings.

Question

I can get a page's wall feed by making a simple javascript api call to:

FB.api("/PAGE_ID/feed", { limit:6 }, function(response){}

This gets the last 6 Posts on the page. I'd like to be able to select the last 6 posts by people who are not the page, however. Is there an undocumented (or documented!) parameter or other way to accomplish this? I suppose I could get a larger portion of the feed and loop through and check the IDs, but I'd rather not.