Comment # 1 on bug 908068 from Bernhard Wiedemann

Steps To Reproduce:
dd if=/dev/zero of=img bs=1M count=100
mkfs.minix img
mount -o loop img /mnt/
(cd /mnt/ ; sleep 1000)&
fuser -m /mnt/
fuser -m /dev/loop0

where the -m /mnt variant returns the right thing,
but the other delivers the result for /
possibly, because that is the first match in /proc/mounts