Django管理站点中的列/字段级别权限？

from django.db import models
from django.contrib.auth.models import Group

class UserProfile(models.Model):
    first_name = models.CharField(max_length=30)
    last_name = models.CharField(max_length=30)
    email = models.EmailField()

    class Meta:
        permissions = [
            ('view_first_name', 'Can view first name'),
            ('view_last_name', 'Can view last name'),
            ('view_email', 'Can view email'),
        ]

group = Group.objects.get(name='user_group')
group.permissions.add(Permission.objects.get(codename='view_first_name'))

from django.contrib import admin
from .models import UserProfile

class UserProfileAdmin(admin.ModelAdmin):
    list_display = ('first_name', 'last_name')

admin.site.register(UserProfile, UserProfileAdmin)