How can I activate/configure a screensaver in Wayland/GNOME?

I am using Fedora 25 with Wayland and GNOME. How can I configure a screensaver? I assume xscreensaver does not work and I could install gnome-screensaver, but there is no configuration interface - or have I missed something there…? **Edit**: To clarify, I am not looking for a simple black screen or a "fade out" effect, but for a "real" screensaver showing some animation or a slideshow of your photos/images or so… ----- Question cross-posted from [Ask Fedora](https://ask.fedoraproject.org/en/question/106077/how-can-i-activateconfigure-a-screensaver-in-waylandgnome/) .