Filtering "NoDotDot" in filesystem model not working

Hi ,
I using filesystem model in my program to display the filesystems....
Its working fine, it displays all the files and directoris including Dot and DotDot....
But i dont want to display the "DotDot" hence i used filter as shown below, unfortunately its not working....IT DISPLAYS DOTDOT ALSO....
Please somebody tell me whats wrong here...

Code:

---

QString sPath=ui->lineEdit_directory->text();
        dirmodel =new QFileSystemModel(this);
        dirmodel->setFilter(QDir::AllDirs | QDir::Dirs |QDir::NoDotDot);    <---HERE "QDir::NoDotDot"  IS NOT WORKING
 
 
        dirmodel->setRootPath(sPath);
        ui->treeView->setModel(dirmodel);
        ui->treeView->setRootIndex(dirmodel->index(sPath));

---

http://qt-project.org/doc/qt-4.8/qdir.html#Filter-enum
QDir::AllDirs 0x400 List all directories; i.e. don't apply the filters to directory names.

OK ....
I changed filter as follows...still ".."(DotDot) is displaying...
dirmodel->setFilter(QDir::NoDotDot | QDir::Dirs );

There's a bug report about that and it will be fixed in next minor relase.