runtime.g.parentGoid (field)

3 uses

	runtime (current package)
		proc.go#L5096: 	newg.parentGoid = callergp.goid
		runtime2.go#L476: 	parentGoid    uint64          // goid of goroutine that created this goroutine
		traceback.go#L779: 		printcreatedby1(f, pc, gp.parentGoid)