code: function (postPostRequestOptions, parentFilterCallback) {
              // The parentFilterNext is the filter next to the merged filter.
              // For 2 filters, that'd be the actual operation.
              parentFilterNext(postPostRequestOptions, function (responseObject, responseCallback, finalCallback) {
                parentFilterCallback(responseObject, finalCallback, function (postResponseObject) {
                  newFilterCallback(postResponseObject, responseCallback, finalCallback);
                });
              });
            }
docs: handle parent filter pre and get Parent filter post