stat method
- String path
override
    Asynchronously calls the operating system's stat() function on path.
Returns a Future which completes with a io.FileStat object containing
the data returned by stat().
If the call fails, completes the future with a io.FileStat object with
.type set to FileSystemEntityType.NOT_FOUND and the other fields invalid.
Implementation
@override
Future<FileStat> stat(String path) {
  try {
    path = _resolve(path);
  } on FileSystemException {
    return Future<FileStat>.value(const _NotFoundFileStat());
  }
  return delegate.stat(_real(path, resolve: false));
}