/usr/ is in ruby-ffi-bit-masks 0.1.1-1.
This file is owned by root:root, with mode 0o755.
..
/usr/share/rubygems-integration/
/usr/share/rubygems-integration/all/
/usr/share/rubygems-integration/all/specifications/
/usr/lib/
/usr/lib/ruby/
/usr/lib/ruby/vendor_ruby/
/usr/lib/ruby/vendor_ruby/ffi/
/usr/lib/ruby/vendor_ruby/ffi/bit_masks.rb
/usr/lib/ruby/vendor_ruby/ffi/bit_masks/
/usr/lib/ruby/vendor_ruby/ffi/bit_masks/bit_mask.rb
/usr/lib/ruby/vendor_ruby/ffi/bit_masks/version.rb
/usr/share/
/usr/share/rubygems-integration/all/specifications/ffi-bit_masks-0.1.1.gemspec
/usr/share/doc/
/usr/share/doc/ruby-ffi-bit-masks/
/usr/share/doc/ruby-ffi-bit-masks/copyright
/usr/share/doc/ruby-ffi-bit-masks/changelog.Debian.gz
/usr/share/doc/ruby-ffi-bit-masks/README.md