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sudo apt-get install nfs4-acl-tools acl

getfacl /slozka <===> muzete nahlizet, kdo ma jake opravneni ve slozkce /slozka a to jak uzivatel tak i skupina
getfacl --access /share | setfacl -d -M- /data <===> zkopiruje ty same vlastnosti(opravneni) ze slozky /share na slozku /data
getfacl foo | setfacl -S - bar <===> To copy the ACL from file foo such that the file bar will have the same ACL

setfacl -m u:franta:rwx /data <===> vsechna opravneni pro uzivatele franta pro slozku /data /**/ -m option (short for --modify)
setfacl -m u:franta:--- /data <===> zadne opravneni pro uzivatele franta pro slozku /data
setfacl -m g:IT:rwx /share <===> povolit r,w,x skupine IT ve slozce /share
setfacl -m mask:r text.cfg <===> set the mask to allow only reading permissions.
setfacl -d -m u:dummy:rw test <===> assign default ACL to it by using the -d option
setfacl -b /data <===> By now just remember that if you want to remove all the ACLs permissions assigned to a file, you just have to run setfacl with the -b (short for --remove-all) option.
setfacl -D e * <===> To delete all of the extended ACL entries for all files and directories in the current working directory
setfacl -x user:user3,d:user:user3,f:user:user3 * <===> To delete all of the extended ACL entries for user user3 for all files and directories in the current directory:

tune2fs -l /dev/sda1 <===> check if the filesystem is mounted with acl support