Use filesystemwatcher to watch files on filetable (SQL sever 2012)

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C#

My program work properly when i use FileSystemWatcher to watch files outside FileTable. When i watch files on FileTable, no any event occur. Who can tell me why?

// Create a new FileSystemWatcher and set its properties.
FileSystemWatcher watcher = new FileSystemWatcher();
watcher.Path = @"\\Dicthanhkha\sqlexpress\DiTranFiles\DiTranslator";
/* Watch for changes in LastAccess and LastWrite times, and
   the renaming of files. */
watcher.NotifyFilter = NotifyFilters.LastWrite | NotifyFilters.FileName;

// Only watch text files.
watcher.Filter = "*.txt";

// Add event handlers.
watcher.Changed += new FileSystemEventHandler(OnChanged);
watcher.Created += new FileSystemEventHandler(OnChanged);
watcher.Deleted += new FileSystemEventHandler(OnChanged);
watcher.Renamed += new RenamedEventHandler(OnRenamed);

// Begin watching.
watcher.EnableRaisingEvents = true;

// Define the event handlers.
private static void OnChanged(object source, FileSystemEventArgs e)
{
    // Specify what is done when a file is changed, created, or deleted.
    Console.WriteLine("File: " + e.FullPath + " " + e.ChangeType);
}

private static void OnRenamed(object source, RenamedEventArgs e)
{
    // Specify what is done when a file is renamed.
    Console.WriteLine("File: {0} renamed to {1}", e.OldFullPath, e.FullPath);
}