/usr/share/samba/setup/idmap_init.ldif 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 | dn: CN=CONFIG
cn: CONFIG
lowerBound: 3000000
upperBound: 4000000
dn: @INDEXLIST
@IDXATTR: xidNumber
@IDXATTR: objectSid
|