/usr/ is in libusb-ocaml-dev 1.3.0-4build1.
This file is owned by root:root, with mode 0o755.
..
/usr/lib/
/usr/lib/ocaml/
/usr/lib/ocaml/usb/
/usr/lib/ocaml/usb/USB.cmi
/usr/lib/ocaml/usb/USB.mli
/usr/lib/ocaml/usb/libusb_stubs.a
/usr/lib/ocaml/usb/usb.a
/usr/lib/ocaml/usb/usb.cmxa
/usr/share/
/usr/share/doc/
/usr/share/doc/libusb-ocaml-dev/
/usr/share/doc/libusb-ocaml-dev/README
/usr/share/doc/libusb-ocaml-dev/changelog.Debian.gz
/usr/share/doc/libusb-ocaml-dev/copyright
/usr/share/doc/libusb-ocaml-dev/html/
/usr/share/doc/libusb-ocaml-dev/html/api/
/usr/share/doc/libusb-ocaml-dev/html/api/USB.Class.html
/usr/share/doc/libusb-ocaml-dev/html/api/USB.DT.html
/usr/share/doc/libusb-ocaml-dev/html/api/USB.Request.html
/usr/share/doc/libusb-ocaml-dev/html/api/USB.html
/usr/share/doc/libusb-ocaml-dev/html/api/index.html
/usr/share/doc/libusb-ocaml-dev/html/api/index_attributes.html
/usr/share/doc/libusb-ocaml-dev/html/api/index_class_types.html
/usr/share/doc/libusb-ocaml-dev/html/api/index_classes.html
/usr/share/doc/libusb-ocaml-dev/html/api/index_exceptions.html
/usr/share/doc/libusb-ocaml-dev/html/api/index_extensions.html
/usr/share/doc/libusb-ocaml-dev/html/api/index_methods.html
/usr/share/doc/libusb-ocaml-dev/html/api/index_module_types.html
/usr/share/doc/libusb-ocaml-dev/html/api/index_modules.html
/usr/share/doc/libusb-ocaml-dev/html/api/index_types.html
/usr/share/doc/libusb-ocaml-dev/html/api/index_values.html
/usr/share/doc/libusb-ocaml-dev/html/api/style.css
/usr/share/doc/libusb-ocaml-dev/html/api/type_USB.Class.html
/usr/share/doc/libusb-ocaml-dev/html/api/type_USB.DT.html
/usr/share/doc/libusb-ocaml-dev/html/api/type_USB.Request.html
/usr/share/doc/libusb-ocaml-dev/html/api/type_USB.html
/usr/share/doc-base/
/usr/share/doc-base/ocaml-usb