/usr/ is in libtrust-store-dev 2.0.0+16.04.20160119-0ubuntu1.
This file is owned by root:root, with mode 0o755.
..
/usr/share/
/usr/share/doc/
/usr/share/doc/libtrust-store-dev/
/usr/share/doc/libtrust-store-dev/copyright
/usr/lib/
/usr/lib/x86_64-linux-gnu/
/usr/lib/x86_64-linux-gnu/pkgconfig/
/usr/lib/x86_64-linux-gnu/pkgconfig/trust-store.pc
/usr/include/
/usr/include/core/
/usr/include/core/trust/
/usr/include/core/trust/expose.h
/usr/include/core/trust/visibility.h
/usr/include/core/trust/dbus_agent.h
/usr/include/core/trust/store.h
/usr/include/core/trust/mir_agent.h
/usr/include/core/trust/cached_agent.h
/usr/include/core/trust/tagged_integer.h
/usr/include/core/trust/resolve.h
/usr/include/core/trust/agent.h
/usr/include/core/trust/request.h
/usr/share/doc/libtrust-store-dev/changelog.Debian.gz
/usr/lib/x86_64-linux-gnu/libtrust-store.so