/usr/share/doc/ is in libestring-ocaml-dev 20130822-5+b1.
This file is owned by root:root, with mode 0o755.
..
/usr/share/doc/libestring-ocaml-dev/
/usr/share/doc/libestring-ocaml-dev/changelog.Debian.amd64.gz
/usr/share/doc/libestring-ocaml-dev/changelog.Debian.gz
/usr/share/doc/libestring-ocaml-dev/changelog.gz
/usr/share/doc/libestring-ocaml-dev/copyright
/usr/share/doc/libestring-ocaml-dev/api/
/usr/share/doc/libestring-ocaml-dev/api/style.css
/usr/share/doc/libestring-ocaml-dev/api/index_module_types.html
/usr/share/doc/libestring-ocaml-dev/api/index_modules.html
/usr/share/doc/libestring-ocaml-dev/api/index_class_types.html
/usr/share/doc/libestring-ocaml-dev/api/index_classes.html
/usr/share/doc/libestring-ocaml-dev/api/index_methods.html
/usr/share/doc/libestring-ocaml-dev/api/index_attributes.html
/usr/share/doc/libestring-ocaml-dev/api/index_types.html
/usr/share/doc/libestring-ocaml-dev/api/index_exceptions.html
/usr/share/doc/libestring-ocaml-dev/api/index_extensions.html
/usr/share/doc/libestring-ocaml-dev/api/index_values.html
/usr/share/doc/libestring-ocaml-dev/api/index.html
/usr/share/doc/libestring-ocaml-dev/api/type_Pa_estring.html
/usr/share/doc/libestring-ocaml-dev/api/Pa_estring.html