How to achieve multiple NFS/TCP connections to the same server?

How to achieve multiple NFS/TCP connections to the same server?

I'm trying to maximize the NFS/TCP bandwidth between a Linux client and a
single NFS server over a 10Gbps link. Although each NFS mount has its own
device (major/minor), everything comes down to a single TCP connection and
this is a bottleneck.
Using iperf and multiple TCP connections, I can reach ~8Gbps, but NFS is
stuck on a single TCP stream and limited to ~2Gbps (no tcp tuning yet).
On Solaris, there's the system setting rpcmod:clnt_max_conns which allow
to set how many concurrent TCP connection the system is able to use to a
single NFS server.
Is there a Linux equivalent or a way to do so ?
As a workaround, I know I could set many IP on the NFS server, and then
load-balance the mountpoints on them but that wouldn't be optimal.
Thank you.