Making a field readonly according to the user in admin.py

[Victor]

Dear experts,

models.py

class Book(models.Model):
    title = models.CharField(max_length=100)
    author = models.CharField(max_length=100)
    quantity = models.IntegerField(db_column='quantitity',default=0)
    class Meta:
        db_table="book"

admin.py

class BookOption(admin.ModelAdmin):
    list_display = ('title', 'author', 'quantity')
    fields=(('title', 'author'), ('quantity'))
    order_by= ['title', ]

admin.site.register(Book,BookOption)


I'm trying to explain my problem with the simple example above. 
Let's suppose that I have two staff users 'victor' and 'roby' and I want that 
the fields 'author and 'quantity' be readonly when user 'roby' is logged in and 
readwrite for user 'victor'
How can I achieve this result if possible with something of the following 
simple kind


class BookOption(admin.ModelAdmin):
    if (user is 'roby'):
        readonly_fields=['quantity',]
    list_display = ('title', 'author', 'quantity')
    fields=(('title', 'author'), ('quantity'))
    order_by= ['title', ]
 
Thanks
Vittorio

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