I have a dataframe with timestamp as index. I want to filter out the rows with similar timestamp and print it out. For example,

```
                        Value_1  Value_2
timestamp                                           
2022-03-22 17:31:02     23        30    
2022-03-22 17:31:02     25        40
2022-03-22 17:31:04     24        0.2   
2022-03-22 17:31:05     21        90    
2022-03-22 17:31:05     20        0.1

```

I want to filter out the rows with similar timestamps as shown below.

```
                        Value_1  Value_2
timestamp                                           
2022-03-22 17:31:02     23        30    
2022-03-22 17:31:02     25        40
2022-03-22 17:31:05     21        90    
2022-03-22 17:31:05     20        0.1

```

I tried using `melt` and `groupby`. It does not give me the desired results. Could someone help me with it?

Thanks.