db.companies.explain().aggregate({$match:{_id:"14"}},{$graphLookup:{from:"companies",startWith:"$_id",connectFromField:"_id",connectToField:"parent",as:"tree",maxDepth:5, depthField:"order"}},{$group:{"_id":"$tree.country"}})
{
	"waitedMS" : NumberLong(0),
	"stages" : [
		{
			"$cursor" : {
				"query" : {
					"_id" : "14"
				},
				"fields" : {
					"tree.country" : 1,
					"_id" : 1
				},
				"queryPlanner" : {
					"plannerVersion" : 1,
					"namespace" : "d.companies",
					"indexFilterSet" : false,
					"parsedQuery" : {
						"_id" : {
							"$eq" : "14"
						}
					},
					"winningPlan" : {
						"stage" : "PROJECTION",
						"transformBy" : {
							"tree.country" : 1,
							"_id" : 1
						},
						"inputStage" : {
							"stage" : "IDHACK"
						}
					},
					"rejectedPlans" : [ ]
				}
			}
		},
		{
			"$graphLookup" : {
				"from" : "companies",
				"as" : "tree",
				"connectToField" : "parent",
				"connectFromField" : "_id",
				"startWith" : "$_id",
				"depthField" : "order",
				"maxDepth" : NumberLong(5)
			}
		},
		{
			"$group" : {
				"_id" : "$tree.country"
			}
		}
	],
	"ok" : 1
}