'Dynamics CRM: Retrieve all OptionSet values of an entity?

I can get all global optionset values by using below api url

{Org Url}/api/data/v8.1/GlobalOptionSetDefinitions(Name='{Global Option Set Name}')

What is the api url to get entity's optionset all values?

Update: It worked for me using below rest url

{YourUrl}/EntityDefinitions(LogicalName='{EntityName}')/Attributes(LogicalName='{OptionSetAttributeName}')/Microsoft.Dynamics.CRM.PicklistAttributeMetadata?$select=LogicalName&$expand=OptionSet



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