When accessing a mount point specified with the x-systemd.autmount option in the fstab file, it is mounted on demand by the [systemd.automount](https://www.freedesktop.org/software/systemd/man/systemd.automount.html) feature. Currently, `duf` will attempt to access an unmounted systemd automount point, resulting in a noticeable delay, and in the worst case, if the drive is offline, duf will hang indefinitely because the automount timeout is disabled by systemd by default. ``` systemd[1]: media-backups.automount: Got automount request for /media/backups, triggered by 741148 (duf) ``` Should it be a reasonable default for `duf` to ignore all unmounted systemd automounts?