Thank you,
I searched on the Internet and the answers were few and ineffective.
But from Samba's documentation,
I think i finded a solution with SMB.conf. I adjusted the following parameters:
create mode = 0770
force create mode = 0770
inherit permissions = no
nt acl support = no ; Apparently, just no visible by windows
profile acls = yes
Now, i'm finding a good combination with these parameters.
Then, i test if everything goes well with different versions of Office.
It's on the right track

Thanks for your help