code: function _getCalleeFilename(calls) {
      calls = (calls|0) + 3; // 3 is a number of inner calls
      const e = {};
      Error.captureStackTrace(e);
      return parseStackLine(e.stack.split(/\n/)[calls]).filename;
  }
docs: Get callee filename
  @param {Number} [calls] - number of additional inner calls
  @returns {String} - filename of a file that call