/usr/src/linux-headers-3.13.0-101-generic/net is in linux-headers-3.13.0-101-generic 3.13.0-101.148.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/src/linux-headers-3.13.0-101-generic/../linux-headers-3.13.0-101/net