code: function showObject (info) {
    var subProps = info.properties;
    if (subProps) {
      var names = [];
      for(var name in subProps) { // prototype ok
        names.push(name);
      }
      var subNames = names.join(',');
      console.log('サブプロパティ : ' + subNames);
    }
  }
docs: オブジェクト(サブプロパティあり)