<SYSTEM_TASK:>
Solve the following problem using Python, implementing the functions described below, one line at a time
<END_TASK>
<USER_TASK:>
Description:
 def filter_facet_queryset(self, queryset):
 """ Given a search queryset, filter it with whichever facet filter backends in use. """

        for backend in list(self.facet_filter_backends):
            queryset = backend().filter_queryset(self.request, queryset, self)

        if self.load_all:
            queryset = queryset.load_all()

        return queryset