layer.smooth is ignored

import QtQuick 2.9
import QtQuick.Controls 2.3
import QtGraphicalEffects 1.0

ApplicationWindow {
    width: 800
    height: 800
    visible: true

    Image {
        id: root
        source: "http://upload.wikimedia.org/wikipedia/commons/f/f0/Pixelart-tv-iso.png"
        smooth: false
        scale: 16
        anchors.centerIn: parent

        layer.enabled: true
        layer.smooth: false
        layer.effect: ColorOverlay {
            anchors.fill: root
            source: root
            color: "#00000000"
        }
    }
}