code: function(file) {
          var FileSystem = require('./fs.js');
          var ReadStream = require('./read_stream.js');
  
          if(FileSystem.fs.existFile(file)) {
              file = FileSystem.fs.pathResolve(file);
              var readStream = new ReadStream(file);
  
              return _.clone(readStream.trackStack);
          } else {
              return false;
          }
      }
docs: track file stack