I always thought it was weird to have both and finally decided to just check
root@Dave-San:/mnt# ls
cache/ disk1/ disk2/ disk3/ user/ user0/
root@Dave-San:/mnt# ls -al
total 0
drwxr-xr-x 8 root root 160 Apr 14 19:51 ./
drwxrwxrwx 19 root root 400 Sep 28 2012 ../
drwxrwxrwx 4 nobody users 80 Apr 16 04:00 cache/
drwxrwxrwx 13 nobody users 304 Feb 26 22:34 disk1/
drwxrwxrwx 13 nobody users 304 Jun 24 2014 disk2/
drwxrwxrwx 3 nobody users 19 Apr 16 04:00 disk3/
drwxrwxrwx 1 nobody users 80 Apr 16 04:00 user/
drwxrwxrwx 1 nobody users 304 Apr 16 04:00 user0/
root@Dave-San:/mnt# mount -l
tmpfs on /var/log type tmpfs (rw,size=128m,mode=0755)
proc on /proc type proc (rw)
sysfs on /sys type sysfs (rw)
/dev/sda1 on /boot type vfat (rw,noatime,nodiratime,umask=0,shortname=mixed) [uNRAID]
nfsd on /proc/fs/nfs type nfsd (rw)
nfsd on /proc/fs/nfsd type nfsd (rw)
/dev/md1 on /mnt/disk1 type reiserfs (rw,noatime,nodiratime,user_xattr,acl)
/dev/md2 on /mnt/disk2 type reiserfs (rw,noatime,nodiratime,user_xattr,acl)
/dev/md3 on /mnt/disk3 type xfs (rw,noatime,nodiratime)
/dev/sdb1 on /mnt/cache type reiserfs (rw,noatime,nodiratime,user_xattr,acl)
shfs on /mnt/user0 type fuse.shfs (rw,nosuid,nodev,noatime,allow_other)
shfs on /mnt/user type fuse.shfs (rw,nosuid,nodev,noatime,allow_other)
/mnt/disk1/docker/containers/docker on /var/lib/docker type btrfs (rw)
root@Dave-San:/mnt# ls user0
Books/ Downloads/ Media/ Music/ TV/ backup/ docker/ movies/ vm_iso/ vm_store/
root@Dave-San:/mnt# ls user
Books/ Downloads/ Media/ Music/ TV/ backup/ docker/ movies/ vm_iso/ vm_store/
root@Dave-San:/mnt#
If user and user0 are both valid, what is the purpose of them as they seem to have the same directories