How to use the filer.Path function in filer

var nohost = (function(window) {

  // The server's filesystem
  var Filer = require('filer');
  var Path = Filer.Path;
  var fs;

  // List of FSWatchers for files in the filesystem
  var watchers = {};

  // Content helpers from the nohost source
  var Content = require('content');

  // Path and Dir for current nohost url
  var nohostPath = document.location.search.substring(1);
  var nohostDir = Path.dirname(nohostPath);

  // Change a url to a path in the filesystem to a Blob URL
  function rewriteURL(url, encoding, callback) {
    if(!url || /\:?\/\//.test(url) || /\s*data\:/.test(url)) {
      return callback(null, url);

* algorithms necessary for rsync and
 * checksum comparison algorithms to check
 * the equivalency of two file systems
 * as well as general validation functions
 *
 * Portions used from Node.js Anchor module
 * Copyright(c) 2011 Mihai Tomescu 
 * Copyright(c) 2011 Tolga Tezel 
 * MIT Licensed
 * https://github.com/ttezel/anchor
*/

var MD5 = require('MD5');
var Filer = require('filer');
var Errors = Filer.Errors;
var Path = Filer.Path;
var async = require('../async-lite');
var fsUtils = require('../fs-utils');

// Rsync Options that can be passed are:
// size       -   the size of each chunk of data in bytes that should be checksumed
// checksum   -   true: always calculate checksums [default]
//                false: ignore checksums for identical files
// recursive  -   true: sync each contained node in the path provided
//                false: only sync the node for the path provided [default]
// time       -   true: sync modified times of source/destination files
//                false: do not change modified times of destination files [default]
// links      -   true: sync symbolic links as links in destination
//                false: sync symbolic links as the files they link to in destination [default]
// versions   -   true: do not sync a node if the last synced version matches the version it needs to be synced to [default]
//                false: sync nodes irrespective of the last synced version
// superficial-   true: if a directory path is provided, only sync the directory and not it's contents