return; // Already watching
        }

        try {
            SmbFile directory = new SmbFile(directoryPath, leaseManager.getContext());
            ChangeNotificationHandle handle = new ChangeNotificationHandle(directoryPath, leaseKey, directory);

            activeWatchers.put(directoryPath, handle);

            // Start async change notification
            startAsyncNotification(handle);

    private final ConcurrentHashMap<String, ChangeNotificationHandle> activeWatchers;
    
    public enum DirectoryChangeType {
        FILE_ADDED,
        FILE_REMOVED,
        FILE_MODIFIED,
        DIRECTORY_RENAMED,
        ATTRIBUTES_CHANGED
    }
    
    public static class ChangeNotificationHandle {
        private final String directoryPath;