code: public function findSubTreeByPath($path, $siteId, $language)
      {
          $qa = $this->buildTreeRequest($language, $siteId);
          $qa->match(array('path' => new \MongoRegex('/'.preg_quote($path).'.+/')));
  
          return $this->hydrateAggregateQuery($qa);
      }
docs: @param string $path
  @param string $siteId
  @param string $language
  
  @return mixed