[Feature Request] set modification time on upload file

I'm analyzing fhe protocol for upload file.
With wireshark I sniffed and decrypted TLS traffic while using megacmd.
When there is an upload there is this POST

POST /cs?id=XXXXX&sid=XXXXXX&ak=XXXXXX&lang=en HTTP/1.1
Host: g.api.mega.co.nz
User-Agent: MEGAcmd/1.2.0.7 (debian 11/Linux 5.10.0-8-amd64 x86_64) MegaClient/3.6.9
Accept: */*
Accept-Encoding: deflate, gzip
Content-Type: application/json
Content-Length: 51

[{"a":"u","v":2,"s":12800,"ms":0,"t":["nqJExLDK"]}]

the latest version of go-mega has only a and s key in json. I don't know what means v : 2 I think version, I don't understand what is ms from cpp code. The key t is for targetuser
I hope someone can help to understand better.