nfs options missing from active mounts on freebsd

Description of Issue

# salt-ssh some-freebsd-server mount.active extended=True
...
    /mnt/backups:                                          
        ----------                                                                                                     
        device:
            192.168.1.20:/srv/backups
        fstype:
            nfs
        opts:
            - rw

# mount -p
192.168.1.20:/srv/backups /mnt/backups          nfs     rw              0 0

# nfsstat -m
192.168.1.20:/srv/backups on /mnt/backups
nfsv3,tcp,resvport,hard,cto,lockd,sec=sys,acdirmin=3,acdirmax=60,acregmin=5,acregmax=60,nametimeo=60,negnametimeo=60,rsize=65536,wsize=65536,readdirsize=65536,readahead=1,wcommitsize=8388608,timeout=120,retrans=2

On FreeBSD Salt is using mount -p under the hood which is not sufficient for NFS mounts. We'd need an additional nfsstat -m AFAIK.

This leads to incorrectly applied mount.mounted when already mounted with correct options on FreeBSD: Forced unmount and mount because options (wsize=65536) changed

/mnt/backups:
  mount.mounted:
  - device: 192.168.1.20:/srv/backups
  - fstype: nfs
  - opts: rw,rsize=65536,wsize=65536
  - persist: True
  - mkmnt: True

Somewhat related to #18630. For now I'm just avoiding to mount when already mounted:

/mnt/backups:
  mount.mounted:
...
  - unless: ['df | grep -q /mnt/backups']

Setup

salt-ssh from my arch linux to freebsd-12 server.

Steps to Reproduce Issue

Versions Report

# freebsd-version
12.0-RELEASE-p8

Salt Version:
           Salt: 2019.2.0

Dependency Versions:
           cffi: 1.12.3
       cherrypy: Not Installed
       dateutil: Not Installed
      docker-py: Not Installed
          gitdb: Not Installed
      gitpython: Not Installed
          ioflo: Not Installed
         Jinja2: 2.10.1
        libgit2: Not Installed
        libnacl: Not Installed
       M2Crypto: 0.34.0
           Mako: Not Installed
   msgpack-pure: Not Installed
 msgpack-python: 0.6.1
   mysql-python: Not Installed
      pycparser: 2.19
       pycrypto: 3.8.2
   pycryptodome: Not Installed
         pygit2: Not Installed
         Python: 2.7.16 (default, Mar 11 2019, 18:59:25)
   python-gnupg: Not Installed
         PyYAML: 5.1.1
          PyZMQ: 18.0.2
           RAET: Not Installed
          smmap: Not Installed
        timelib: Not Installed
        Tornado: 5.1.1
            ZMQ: 4.3.1

System Versions:
           dist:
         locale: UTF-8
        machine: x86_64
        release: 5.2.3-1-ck-broadwell
         system: Linux
        version: Not Installed

Start with the mount.active behavior described for FreeBSD and compare the reported output from mount -p with nfsstat -m. Trace how those options feed into mount.mounted, then verify that an already-mounted NFS filesystem with matching options is not unnecessarily unmounted and remounted.