Available filters variants

Hello! I am trying to make product filters and I’ve got one problem. How can I get all available values for facet flters? When I make request with more than one facet filters I have field “facets” in response but there are not all available values, I can choose just between values that I selected before in first used filter http://joxi.ru/V2VpWooH0yG0gr . Also I need to get price range and I have that in “facet_stats” only when I use filtering by price.

P.S. I use PHP API .