title: Django custom queryset inside ModelSerializer
body: <p>I have a <code>PostSerializer</code> that has a <code>comments</code> field which use <code>CommentSerializer</code>. I want to change the queryset of this <code>CommentSerializer</code> so that it won't show all comments at once. Here's the code</p>
  
  <pre><code>class PostSerializer(serializers.ModelSerializer):
      comments = SimplifiedCommentSerializer(
          many=True,
          required=False,
      )
  
      class Meta:
          model = Post
          fields = ('comments')
  
  class SimplifiedCommentSerializer(serializers.ModelSerializer):
      content = serializers.TextField()
  
      # this function doesn't seem to work
      def get_queryset(self):
          return Comment.objects.all()[:10]
  
      class Meta:
          model = Comment
          fields = ('content')
  </code></pre>
  
  <p>I've tried using get_queryset inside the <code>SimplifiedCommentSerializer</code>, but I still get all the comments instead of the first 10.</p>