QDir::entryInfoList() reports system files regardless of System filter flag

#include <QtCore>
#include <QDebug>

int main( int argc, char * argv[] )
{
    QCoreApplication app( argc, argv );
    QDir dir("c:\\");
    dir.setFilter( QDir::Files | QDir::System );
    QFileInfoList entryInfoList = dir.entryInfoList(dir.filter());

    qDebug() << entryInfoList.size();

    foreach(const QFileInfo& info, entryInfoList)
    qDebug() << info.fileName();
    return 0;
}