Per default, only 1000 FUSE mounts are allowed, then you get
> /usr/bin/fusermount3: too many FUSE filesystems mounted; mount_max=N can be set in /etc/fuse.conf

Let's stay well below 1000 as there may be other (unrelated)
FUSE mounts also occupying slots.

Change-Id: I2e2e094a88236ff803abba3722395c29207c8571