code: function getFileInfo(fileId, filePath, cb, repeated){ // cb(err, fileInfo)
      repeated = repeated || 0;
      var fullPath = resolve(filePath).fullPath;
      
      fs.exists(fullPath, function(exists){
          if(!exists) cb();
          else fs.stat(fullPath, function(err, stat){
              if(err && err.code === 'ENOENT') { // directory or file removed, just skip it
                  cb();
              }
              else if(err && repeated < 5) setTimeout(function(){
                  getFileInfo(fileId, fullPath, cb, repeated+1);
              }, 200);
              else if(err) cb(err);
              else cb(null, getFileItem(fileId, stat, fullPath));
          });
      });
  }
docs: get resolved file info & stats
  @param {String} fileId
  @param {String} fullPath
  @param {Function} cb
  @param {Integer} repeated