Config represents the configuration to create a manager. It takes a root directory that is used to create a block device that controls project quotas

Control gives the context to be used by storage driver who wants to apply project quotas to container dirs.

ControlConfig specifies the configuration to be used by the controller that will hold the quota allocation state.

Manager is the entity responsible for managing volumes under a given base path. It takes the responsability of 'CRUD'ing these volumes.

Quota defines the limit params to be applied or that are already set to a project. Fields named `Used` are meant to `Get` operations only, to display

Volume represents a volume under a given root path that has a project quota associated with it.