runtime.g.parentGoid (field)

3 uses

	runtime (current package)
		proc.go#L5353: 	newg.parentGoid = callergp.goid
		runtime2.go#L558: 	parentGoid      uint64          // goid of goroutine that created this goroutine
		traceback.go#L780: 		printcreatedby1(f, pc, gp.parentGoid)