In theory creating the driveItem to accepting a shared resource
can be done via '/v1beta1/drives/{drive-id}/item/{item-id}/children'
but there is also the simplified variant via
'/v1beta1/drives/{drive-id}/root/children' (aligned with the example
in the spec). For now we'll just implement the latter because accepting
a share will always be done via root of the sharejail drive.
(cherry picked from commit c8a89e92f1ad662b6931bd8089795228e8492ae6)
d005bb858b