/usr/ is in ruby-fast-stemmer 1.0.2-1build6.
This file is owned by root:root, with mode 0o755.
..
/usr/lib/
/usr/lib/x86_64-linux-gnu/
/usr/lib/x86_64-linux-gnu/ruby/
/usr/lib/x86_64-linux-gnu/ruby/vendor_ruby/
/usr/lib/x86_64-linux-gnu/ruby/vendor_ruby/2.3.0/
/usr/lib/x86_64-linux-gnu/ruby/vendor_ruby/2.3.0/stemmer.so
/usr/lib/ruby/
/usr/lib/ruby/vendor_ruby/
/usr/lib/ruby/vendor_ruby/fast_stemmer.rb
/usr/lib/ruby/vendor_ruby/fast-stemmer.rb
/usr/share/
/usr/share/lintian/
/usr/share/lintian/overrides/
/usr/share/lintian/overrides/ruby-fast-stemmer
/usr/share/rubygems-integration/
/usr/share/rubygems-integration/2.3.0/
/usr/share/rubygems-integration/2.3.0/specifications/
/usr/share/rubygems-integration/2.3.0/specifications/fast-stemmer-1.0.2.gemspec
/usr/share/doc/
/usr/share/doc/ruby-fast-stemmer/
/usr/share/doc/ruby-fast-stemmer/copyright
/usr/share/doc/ruby-fast-stemmer/changelog.Debian.gz
/usr/share/doc/ruby-fast-stemmer/README