Rrestrict files and folders access to certain groups

Dear All,

I have got a request from a client to restrict access to certain folders/files based on a certain group. for example I have 10 Folders, 10 Groups and each of these groups need to one group meanwhile being able to upload/change files in other folders. 

An Example

Group 1 can access/read and change folder 1 but can only access folder 2 and can't change its content. 

Group 2 can access/read Folder 1 but can't change its content ..etc 

I tried looking into conditional access but couldn't find a way to do so.

Can anyone please shed a light on how this is doable 

Thank you