/usr/share/samba/setup/memberof.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 4 5 6 7 8 | overlay memberof
memberof-dn cn=samba-admin,cn=samba
memberof-dangling error
memberof-refint TRUE
memberof-group-oc top
memberof-member-ad ${MEMBER_ATTR}
memberof-memberof-ad ${MEMBEROF_ATTR}
memberof-dangling-error 32
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