automount fails but mount does not

[Simão <freedesktop.org@xxxxxxxxx>]

I have the following entry in my fstab:

```
/home/simao/bin/encfs-mount#sync /home/simao/sync      fuse            noauto,user,owner,x-systemd.automount,allow_other     0 0
```

This calls my encfs-mount script to mount an encfs volume. That script uses `sudo -u simao` to actually call encfs, because I want the volume to be mounted as a user.

Running `sudo systemctl start home-simao-sync.mount` mounts the volume correctly, and I can access it as a normal user.

But umounting the volume and enabling `home-simao-sync.automount` does not work, I get the following in `journalctl`:

```
Mar 13 10:02:35 asterix sudo[476185]: pam_unix(sudo:session): session opened for user simao(uid=1000) by (uid=0)
Mar 13 10:02:36 asterix mount[476190]: fusermount: user has no write access to mountpoint /home/simao/sync
Mar 13 10:02:36 asterix mount[476188]: fuse failed.  Common problems:
Mar 13 10:02:36 asterix mount[476188]:  - fuse kernel module not installed (modprobe fuse)
Mar 13 10:02:36 asterix mount[476188]:  - invalid options -- see usage message
```

That directory has the correct permissions, otherwise `.mount` would not work.

Running my script with strace, the only interesting line is:

```
Mar 13 10:00:14 asterix mount[475558]: touch: setting times of '/home/simao/sync': Permission denied
```

But I can touch that dir as my user.

Any ideas of what might be wrong?