[CentOS] read only sftp access

Hi,

I'm trying to setup read-only SFTP repo. The directory that I'm planning to
make available via sftp needs to have only read-only access. My issue is
that this specific directory is already available for read & write access
but under different credentials. When I try to login via my read-only
account, openssh spits out an error about incorrect permissions. Any idea
how can I share the same directory via sftp under two different usernames
under the same filesystem permissions?
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