title: Display objects related current user django admin
body: <p>I'm trying to display only objects related to the current user. Users can upload a file and then they can only see their files in the admin. Here is my models :</p>
  
  <pre><code>class Share(models.Model):
      owner = models.ForeignKey(User, default='')
      title = models.CharField("File's title", max_length=100, unique=True, default='File')
      zip_file = models.FileField('Shared File', upload_to=content_zip_name, validators= [validation_zip])
  </code></pre>
  
  <p>and my admin.py</p>
  
  <pre><code>from django.contrib import admin
  from share.models import Share
  
  class ShareAdmin(admin.ModelAdmin):
      list_display = ('title',)
      save_as = True
  
      def queryset(self, request):
          qs = super(ShareAdmin, self).queryset(request)
          if request.user.is_superuser:
              return qs
          return qs.filter(owner=request.user)
  
  admin.site.register(Share, ShareAdmin)
  </code></pre>
  
  <p>I tried with overriding the queryset function but doesn't work..any idea? </p>