title: How to filter nested data in django rest framework?
body: <p>In my detail view I have followig result</p>
  
  <pre><code>{ // measure object
      "id": 5,
      "name": "co",
      "averages": [ // list of averages
          {
              "start": "2016-05-15T12:18:15Z",
              "end": "2016-05-15T12:18:16Z",
              "value": 22.0,
              "length": 4
          }
      ]
  }
  </code></pre>
  
  <p>I need to dispay in <code>averages</code> filtered data e.g 20 &lt; value &lt; 30.
  How to realize it? </p>
  
  <p>View:</p>
  
  <pre><code>class MeasuresList(viewsets.ModelViewSet):
      serializer_class = serializers.DetailedMeasureSerializer
  
      def get_queryset(self):
          return Measure.objects.all()
  </code></pre>