This way we'll not add deps for the mount point that unmount it during
shutdown. This is similar as for /run/initramfs/ which we want to
transition into during shutdown.
This way we don't have to add "-o x-initrd.mount" to all bind mounts for
/run/nextroot anymore to make it survive the reboot, it will be implied.
if (PATH_STARTSWITH_SET(mount,
"/run/initramfs", /* This should stay around from before we boot until after we shutdown */
+ "/run/nextroot", /* Similar (though might be updated from the host) */
"/proc", /* All of this is API VFS */
"/sys", /* … dito … */
"/dev")) /* … dito … */