Setfacl: Operation not supported [duplicate]

Possible Duplicate:
setfacl: x.txt: Operation not supported

I am trying to do:

setfacl -m d:u:apache:rw /etc/asterisk/additional/

but getting:

setfacl: /etc/asterisk/additional/: Operation not supported

my /etc/fstab looks like this:

LABEL=/     /           ext4    defaults,noatime  1   1
tmpfs       /dev/shm    tmpfs   defaults        0   0
devpts      /dev/pts    devpts  gid=5,mode=620  0   0
sysfs       /sys        sysfs   defaults        0   0
proc        /proc   proc    defaults        0   0
/dev/sda3   none    swap    sw,comment=cloudconfig  0   0

Can someone help me please? I tried what others tried and ended up screwing my server and had reinstall. Now I'm back at this step and don't wanna do the same mistake. Any help is appreciated!

Try adding ',acl' after noatime. Then reboot or just invoke mount -o remount /.