[/** 1*/{"_id":"5fbf852902fe571c41d07c9f","insertionTime":"2020-11-26T10:36:25.600Z"},/** 2*/{"_id":"5fbf852902fe571c41d07ca0","insertionTime":"2020-11-26T10:36:25.600Z"},/** 3*/{"_id":"5fbf852902fe571c41d07ca1","insertionTime":"2020-11-24T10:36:25.600Z"},/** 4*/{"_id":"5fbf854702fe571c41d07ca9","insertionTime":"2020-11-23T10:36:55.582Z"}]

db.collection.aggregate([{$sort:{insertionTime:-1}},{$group:{_id:null,latestDoc:{$first:"$$ROOT"},allDocs:{$push:"$$ROOT"}}},{$project:{allDocs:{$filter:{input:"$allDocs",cond:{$eq:["$$this.insertionTime","$latestDoc.insertionTime"]}}}}},{$unwind:"$allDocs"},{"$replaceRoot":{"newRoot":"$allDocs"}}])