/usr/src/linux-headers-4.4.0-57-generic/ is in linux-headers-4.4.0-57-generic 4.4.0-57.78.
This file is owned by root:root, with mode 0o755.
There are a lot of files here (9768 total).
We're only showing the immediate contents of /usr/src/linux-headers-4.4.0-57-generic
.