code: function getResponseDataWhole (fileStats/* , headers*/) {
  	return {
  		body      : fs.createReadStream(fileStats.path),
  		statusCode: HTTP_CODES.OK,
  		headers   : {
  			'Content-Type'  : mime(fileStats.path),
  			'Content-Length': fileStats.size,
  			'Last-Modified' : fileStats.mtime.toUTCString()
  		}
  	};
  }
docs: Creates responseData object with body set to readable stream of requested file.
  
  @param {!external:"fs.Stats"} fileStats
  @param {!string}              fileStats.path    path to the file in local filesystem
  @param {!Date}                fileStats.mtime   date of last modification of file content
  @param {!Number}              fileStats.size    number of bytes of data file contains
  @param {!Object}              headers
  @return {module:serve-files~responseData}