/usr/share/samba/setup/refint.conf is in samba4 4.0.0~alpha18.dfsg1-4ubuntu2.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 | overlay refint
refint_modifiersName cn=samba-admin,cn=samba
refint_attributes ${LINK_ATTRS}
|