code: func getFiltersQuery(f filters.Args) (url.Values, error) {
  	query := url.Values{}
  	if f.Len() > 0 {
  		filterJSON, err := filters.ToJSON(f)
  		if err != nil {
  			return query, err
  		}
  		query.Set("filters", filterJSON)
  	}
  	return query, nil
  }
docs: // getFiltersQuery returns a url query with "filters" query term, based on the
  // filters provided.