cd /vagrant/

$ getfacl logs/
# file: logs/
# owner: vagrant
# group: vagrant
user::rwx
group::r-x
other::r-x

$ setfacl -R -m u:www-data:rwx logs/
setfacl: logs/: Operation not supported
setfacl: logs//empty: Operation not supported

$ mount | grep -w /
6:/dev/mapper/vagrant--vg-root on / type ext4 (rw,relatime,errors=remount-ro,data=ordered)

/dev/mapper/vagrant--vg-root /               ext4    errors=remount-ro,acl 0       1
 UUID=e22caf61-124b-4fcb-9a1c-2e4512fc7188 /boot           ext2    defaults        0       2
 /dev/mapper/vagrant--vg-swap_1 none            swap    sw              0       0