/usr/ is in libgranite-dev 0.3.0-2~experimental1ubuntu2.
This file is owned by root:root, with mode 0o755.
..
/usr/lib/x86_64-linux-gnu/
/usr/lib/x86_64-linux-gnu/pkgconfig/
/usr/share/
/usr/share/vala/
/usr/share/vala/vapi/
/usr/share/vala/vapi/granite.vapi
/usr/share/vala/vapi/granite.deps
/usr/share/gir-1.0/
/usr/share/gir-1.0/Granite-1.0.gir
/usr/share/doc/
/usr/share/doc/libgranite-dev/
/usr/share/doc/libgranite-dev/copyright
/usr/lib/
/usr/lib/x86_64-linux-gnu/pkgconfig/granite.pc
/usr/include/
/usr/include/granite/
/usr/include/granite/widgets-utils.h
/usr/include/granite/granite.h
/usr/share/doc/libgranite-dev/changelog.Debian.gz
/usr/lib/x86_64-linux-gnu/libgranite.so