Filtering "NoDotDot" in filesystem model not working

[aurora]

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...

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));

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));

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