code: function _fnBefore(options, node) {
                  if (options.filter.length === 0) {
                      return true;
                  } else {
                      return _fnProccess(node, options.filter, options.beginAnd || false);
                  }
              }
docs: `fnBefore` will called when `for_all_descendants` of `node` checking.
  If `filter` empty then return `true` else result of function `_fnProccess` {@see _fnProccess}
  
  @param {object} options
  @param {object} node
  @returns {null|boolean}
  @private