code: def filter(self, request, queryset, view):
          
          summary_queryset = queryset
          filtered_querysets = []
          for queryset in summary_queryset.querysets:
              filter_class = self._get_filter(queryset)
              queryset = filter_class(request.query_params, queryset=queryset).qs
              filtered_querysets.append(queryset)
  
          summary_queryset.querysets = filtered_querysets
          return summary_queryset
docs: Filter each resource separately using its own filter