cat /boot/config-4.4.0-31-generic

  CONFIG_EXT4_FS_XATTR=y
  CONFIG_EXT4_FS_SECURITY=y
  CONFIG_EXT4_FS_POSIX_ACL=y

  sample:
  
  /dev/...          /srv/samba/demo          ext4          defaults,barrier=1          1 1

  Test for xattr:

  # touch test.txt
  # setfattr -n user.test -v test test.txt
  # setfattr -n security.test -v test2 test.txt
  
  # getfattr -d test.txt
  # file: test.txt
  user.test="test"
  
  # getfattr -n security.test -d test.txt
  # file: test.txt
  security.test="test2"

  Test for ACL:

  # touch test.txt
  # setfacl -m g:adm:rwx test.txt
  
  # getfacl test.txt
  # file: test.txt
  # owner: root
  # group: root
  user::rw-
  group::r--
  group:adm:rwx
  mask::rwx
  other::r--