/usr/ is in ruby-mixlib-archive 0.2.0-1+deb9u1.
This file is owned by root:root, with mode 0o755.
..
/usr/lib/
/usr/lib/ruby/
/usr/lib/ruby/vendor_ruby/
/usr/lib/ruby/vendor_ruby/mixlib/
/usr/lib/ruby/vendor_ruby/mixlib/archive/
/usr/lib/ruby/vendor_ruby/mixlib/archive/tar.rb
/usr/lib/ruby/vendor_ruby/mixlib/archive/version.rb
/usr/lib/ruby/vendor_ruby/mixlib/archive.rb
/usr/share/
/usr/share/doc/
/usr/share/doc/ruby-mixlib-archive/
/usr/share/doc/ruby-mixlib-archive/README.md
/usr/share/doc/ruby-mixlib-archive/changelog.Debian.gz
/usr/share/doc/ruby-mixlib-archive/copyright
/usr/share/rubygems-integration/
/usr/share/rubygems-integration/all/
/usr/share/rubygems-integration/all/specifications/
/usr/share/rubygems-integration/all/specifications/mixlib-archive-0.2.0.gemspec