/usr/share/ is in libgtk-3-dev 3.22.30-1ubuntu1.
This file is owned by root:root, with mode 0o755.
..
/usr/share/doc/
/usr/share/doc/libgtk-3-dev/
/usr/share/aclocal/
/usr/share/aclocal/gtk-3.0.m4
/usr/share/doc/libgtk-3-dev/copyright
/usr/share/gir-1.0/
/usr/share/gir-1.0/Gdk-3.0.gir
/usr/share/gir-1.0/GdkX11-3.0.gir
/usr/share/gir-1.0/Gtk-3.0.gir
/usr/share/glib-2.0/
/usr/share/glib-2.0/schemas/
/usr/share/glib-2.0/schemas/org.gtk.Settings.Debug.gschema.xml
/usr/share/gtk-3.0/
/usr/share/gtk-3.0/gtkbuilder.rng
/usr/share/doc/libgtk-3-dev/AUTHORS
/usr/share/doc/libgtk-3-dev/NEWS.gz
/usr/share/doc/libgtk-3-dev/README
/usr/share/doc/libgtk-3-dev/changelog.Debian.gz