func ValidateMountMode(mode string) (bool, bool) {
	return roModes[mode] || rwModes[mode], rwModes[mode]
}
ValidateMountMode will make sure the mount mode is valid.
returns if it's a valid mount mode and if it's read-write or not.
package volume
const DefaultDriverName string = "local"
type Driver interface {
	Name() string
	Create(string) (Volume, error)
	Remove(Volume) error
}
type Volume interface {
	Name() string
	DriverName() string
	Path() string
	Mount() (string, error)
	Unmount() error
}
var rwModes = map[string]bool{
	"rw":   true,
	"rw,Z": true,
	"rw,z": true,
	"z,rw": true,
	"Z,rw": true,
	"Z":    true,
	"z":    true,
}
var roModes = map[string]bool{
	"ro":   true,
	"ro,Z": true,
	"ro,z": true,
	"z,ro": true,
	"Z,ro": true,
}