Display contents of a fstab(5) file defined in specified
    jail's configuration. If no file is defined, return False.

    CLI Example:

    .. code-block:: bash

        salt '*' jail.fstab <jail name>

def fstab(jail):
    '''
    Display contents of a fstab(5) file defined in specified
    jail's configuration. If no file is defined, return False.

    CLI Example:

    .. code-block:: bash

        salt '*' jail.fstab <jail name>
    '''
    ret = []
    config = show_config(jail)
    if 'fstab' in config:
        c_fstab = config['fstab']
    elif 'mount.fstab' in config:
        c_fstab = config['mount.fstab']
    if 'fstab' in config or 'mount.fstab' in config:
        if os.access(c_fstab, os.R_OK):
            with salt.utils.files.fopen(c_fstab, 'r') as _fp:
                for line in _fp:
                    line = salt.utils.stringutils.to_unicode(line)
                    line = line.strip()
                    if not line:
                        continue
                    if line.startswith('#'):
                        continue
                    try:
                        device, mpoint, fstype, opts, dump, pas_ = line.split()
                    except ValueError:
                        # Gracefully continue on invalid lines
                        continue
                    ret.append({
                        'device': device,
                        'mountpoint': mpoint,
                        'fstype': fstype,
                        'options': opts,
                        'dump': dump,
                        'pass': pas_
                        })
    if not ret:
        ret = False
    return ret