Watching a directory doesn't watch nested symlinks when followSymlinks = true

[ofagbemi]

Here's a repro: https://github.com/ofagbemi/watchpack-symlinks

If I set followSymlinks: true and pass a path to a real directory with symlinks nested inside, the symlinked files don't get watched. followSymlinks only seems to work if the watched file or a directory itself is a symlink.

const wp = new Watchpack({ followSymlinks: true });

wp.watch({
  files: [
    "file_symlink", // watched correctly
  ],
  directories: [
    "directory_symlink", // real files inside the linked directory are watched correctly
    "real_directory_containing_symlink", // symlink inside of directory isn't watched
  ],
});