Everyone has readwrite access under /DataVolume/shares?

i tried to create a test file with root id, and permission mode set to 000. but i noticed other users still have read/write access on it? anyone knows how to fix it?

unic@MyBookLive:/DataVolume/shares$ ls -al test
---------- 1 root root 0 2012-09-05 12:17 test
unic@MyBookLive:/DataVolume/shares$ echo "some text...." > test
unic@MyBookLive:/DataVolume/shares$ cat test
some text....
unic@MyBookLive:/DataVolume/shares$ id
uid=1000(unic) gid=1000(share) groups=33(www-data),1000(share)
unic@MyBookLive:/DataVolume/shares$ ls -l test
---------- 1 root root 14 2012-09-05 12:19 test
unic@MyBookLive:/DataVolume/shares$

Possibly the fact that the MBL uses “trustees,” not basic permissions.