/usr/src/linux-source-3.13.0/debian.master/d-i/modules/nfs-modules is in linux-source-3.13.0 3.13.0-119.166.
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 | nfs ?
nfs_acl ?
nfsv3 ?
lockd ?
sunrpc ?
cifs ?
|