/usr/include/snapd-qt/ is in libsnapd-qt-dev 1.39-0ubuntu1.
This file is owned by root:root, with mode 0o755.
..
/usr/include/snapd-qt/Snapd/
/usr/include/snapd-qt/Snapd/Alias
/usr/include/snapd-qt/Snapd/App
/usr/include/snapd-qt/Snapd/Assertion
/usr/include/snapd-qt/Snapd/AuthData
/usr/include/snapd-qt/Snapd/Change
/usr/include/snapd-qt/Snapd/Channel
/usr/include/snapd-qt/Snapd/Client
/usr/include/snapd-qt/Snapd/Connection
/usr/include/snapd-qt/Snapd/Enums
/usr/include/snapd-qt/Snapd/Icon
/usr/include/snapd-qt/Snapd/Plug
/usr/include/snapd-qt/Snapd/Price
/usr/include/snapd-qt/Snapd/Request
/usr/include/snapd-qt/Snapd/Screenshot
/usr/include/snapd-qt/Snapd/Slot
/usr/include/snapd-qt/Snapd/Snap
/usr/include/snapd-qt/Snapd/SystemInformation
/usr/include/snapd-qt/Snapd/Task
/usr/include/snapd-qt/Snapd/UserInformation
/usr/include/snapd-qt/Snapd/WrappedObject
/usr/include/snapd-qt/Snapd/alias.h
/usr/include/snapd-qt/Snapd/app.h
/usr/include/snapd-qt/Snapd/assertion.h
/usr/include/snapd-qt/Snapd/auth-data.h
/usr/include/snapd-qt/Snapd/change.h
/usr/include/snapd-qt/Snapd/channel.h
/usr/include/snapd-qt/Snapd/client.h
/usr/include/snapd-qt/Snapd/connection.h
/usr/include/snapd-qt/Snapd/enums.h
/usr/include/snapd-qt/Snapd/icon.h
/usr/include/snapd-qt/Snapd/plug.h
/usr/include/snapd-qt/Snapd/price.h
/usr/include/snapd-qt/Snapd/request.h
/usr/include/snapd-qt/Snapd/screenshot.h
/usr/include/snapd-qt/Snapd/slot.h
/usr/include/snapd-qt/Snapd/snap.h
/usr/include/snapd-qt/Snapd/system-information.h
/usr/include/snapd-qt/Snapd/task.h
/usr/include/snapd-qt/Snapd/user-information.h
/usr/include/snapd-qt/Snapd/wrapped-object.h