Ext4 POSIX Access Control Lists

configname: CONFIG_EXT4_FS_POSIX_ACL

Linux Kernel Configuration
└─>File systems
└─>Ext4 POSIX Access Control Lists
In linux kernel since version 2.6.28 (release Date: 2008-12-24)  
POSIX Access Control Lists (ACLs) support permissions for users and
groups beyond the owner/group/world scheme.

To learn more about Access Control Lists, visit the POSIX ACLs for
Linux website <http://acl.bestbits.at/>.

If you don't know what Access Control Lists are, say N