Hello,
I would start by finding out what it is mounted as. Use the mount command by it's self to see what filesystems are mounted and where they are mounted.
Below are the results from running mount on my laptop...
[root@lptp1 ~]# mount
/dev/mapper/vg_lptp1-lv_root on / type ext4 (rw)
proc on /proc type proc (rw)
sysfs on /sys type sysfs (rw)
devpts on /dev/pts type devpts (rw,gid=5,mode=620)
tmpfs on /dev/shm type tmpfs (rw)
/dev/sda1 on /boot type ext4 (rw)
/dev/mapper/vg_lptp1-LogVol02 on /nfs type ext4 (rw)
none on /proc/sys/fs/binfmt_misc type binfmt_misc (rw)
sunrpc on /var/lib/nfs/rpc_pipefs type rpc_pipefs (rw)
fusectl on /sys/fs/fuse/connections type fusectl (rw)
gvfs-fuse-daemon on /home/rod/.gvfs type fuse.gvfs-fuse-daemon (rw,nosuid,nodev,user=rod)
Once you see how and where the fuse filesystem is mounted then unmount the specific connection to the filesystem with
umount <filesystem> <mount point>