graph/sharedWithMe: Fix 'parentReference' on 'driveItem'

The outer parentreference should refer to the drive containing the mountpoint.
In our case this is the storagespaceid of the virtual share jail.

Also 'CreatedBy' should be the same as on the wrapped remote item. Not the share creator.
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Gitea Version: 1.28.0+dev-477-g8b6ad49a5f