/usr/ is in libmuffin-dev 2.8.4-1.
This file is owned by root:root, with mode 0o755.
..
/usr/include/muffin/meta/window.h
/usr/share/
/usr/share/gir-1.0/
/usr/share/gir-1.0/Meta-Muffin.0.gir
/usr/share/doc/
/usr/share/doc/libmuffin-dev/
/usr/share/doc/libmuffin-dev/copyright
/usr/lib/
/usr/lib/x86_64-linux-gnu/
/usr/lib/x86_64-linux-gnu/pkgconfig/
/usr/lib/x86_64-linux-gnu/pkgconfig/muffin-plugins.pc
/usr/lib/x86_64-linux-gnu/pkgconfig/libmuffin.pc
/usr/include/
/usr/include/muffin/
/usr/include/muffin/meta/
/usr/include/muffin/meta/util.h
/usr/include/muffin/meta/prefs.h
/usr/include/muffin/meta/compositor.h
/usr/include/muffin/meta/theme.h
/usr/include/muffin/meta/meta-shadow-factory.h
/usr/include/muffin/meta/screen.h
/usr/include/muffin/meta/main.h
/usr/include/muffin/meta/preview-widget.h
/usr/include/muffin/meta/common.h
/usr/include/muffin/meta/display.h
/usr/include/muffin/meta/atomnames.h
/usr/include/muffin/meta/meta-window-actor.h
/usr/include/muffin/meta/types.h
/usr/include/muffin/meta/meta-plugin.h
/usr/include/muffin/meta/meta-shaped-texture.h
/usr/include/muffin/meta/meta-background-actor.h
/usr/include/muffin/meta/boxes.h
/usr/include/muffin/meta/workspace.h
/usr/include/muffin/meta/errors.h
/usr/include/muffin/meta/keybindings.h
/usr/include/muffin/meta/gradient.h
/usr/include/muffin/meta/group.h
/usr/include/muffin/meta/compositor-muffin.h
/usr/share/doc/libmuffin-dev/changelog.Debian.gz
/usr/lib/x86_64-linux-gnu/libmuffin.so